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Civilian deaths caused by both sides amounted to a significant percentage of total deaths, perhaps from 30 to nearly 50 percent. Civilian deaths caused by communist forces, which included the Viet Cong, North Vietnamese Army, Pathet Lao and Khmer Rouge, mostly resulted from assassinations and terror tactics. Civilian deaths caused by the armed forces of the governments of South Vietnam, Cambodia, Laos, the United States, South Korea, and other allies were primarily the consequence of extensive aerial bombing and the use of massive firepower in military operations conducted in heavily populated areas. The nature of the war often made it difficult to distinguish between combatants and non-combatants.